From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtp-0.hosting.atlantic.net (smtp-0.hosting.atlantic.net [209.208.105.24]) by ozlabs.org (Postfix) with ESMTP id 2DE7EDE096 for ; Sun, 20 Apr 2008 15:49:16 +1000 (EST) Message-ID: <480AD64E.1040406@valleytech.com> Date: Sun, 20 Apr 2008 01:36:14 -0400 From: "R. Ebersole (VTI - new)" MIME-Version: 1.0 To: linuxppc-embedded@ozlabs.org. Subject: mpc8349, gb ethernet, bridging Content-Type: text/plain; charset=ISO-8859-1; format=flowed List-Id: Linux on Embedded PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Hi. We are having some issues regarding bridging the 2 ethernet ports of an mpc8349, and are trying to determine what is going on. We are attempting to daisy-chain several mpc8349-based boards via the 2 ethernet ports on each 8349. When we enable bridging for the units, we (sometimes) start seeing the following on one of the interior bridge's (mostly on the root bridge) console(s): NETDEV WATCHDOG: eth1 : transmit timed out We then see the bridge output messages that indicate that is is going through a topology state change. This situation keeps recurring. At some point, the message from the bridge that it is entering a disabled state for port #2 (eth1) is followed by garbage (actually, it appears to be some pointers and/or memory addresses printed out), and the system hangs. We are using NAPI and the skbuff-recycling for the gianfar driver. We use ring(s) of 32 buffers. The gianfar's watchdog is set to 1Hz (once a seond ?) We are not sure if/how affect things: Port #1 of the 'root' bridge is attached directly to our LAN Port #1 of the 'root' bridge runs at 10 Mbs Port #2 of the 'root' bridge runs at 1Gbs All other ports in the chain are 1Gbs We are using CAT-5 cables for all connections We have an application on each bridge in the chain that periodically sends several hundred bytes 'up the chain', towards its head (ie, towards our LAN). This application is typically running when the issue is seen. Setting the bridge's forwarding delay to 0 and hellotime to 6,000 helped, but did not solve the issue. ??? -- Sometimes I feel like a red shirt in the Star Trek episode of life. -- This message contains confidential information and is intended only for the individual named. If you are not the intended recipient you should not disseminate, distribute or copy this e-mail. Please notify the sender immediately by e-mail if you have received this e-mail by mistake and delete this e-mail from your system.